<template>
    <div>
     <!-- 面包屑导航 -->
     <el-breadcrumb separator="/">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>添加商品</el-breadcrumb-item>
     </el-breadcrumb>

     <!-- 卡片视图区域 -->
     <el-card>
       <!-- 提示区域 -->
       <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>
       <!-- 进度条 -->
       <el-steps :space="200" :active="acitiveIndex - 0" finish-status="success" align-center>
         <el-step title="基本信息" ></el-step>
         <el-step title="商品参数" ></el-step>
         <el-step title="商品属性" ></el-step>
         <el-step title="商品图片" ></el-step>
         <el-step title="商品内容" ></el-step>
         <el-step title="完成" ></el-step>
       </el-steps>
    <!-- 侧边tab栏 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
       <el-tabs :tab-position="'left'"  v-model="acitiveIndex" :before-leave="beforeTabLeave" @tab-click="tabClick">
         <el-tab-pane label="基本信息" name="0">
            <!-- 渲染表单item项 -->
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="catelist"
                  :props="cateProps"
                  @change="handleChange">
                </el-cascader>
            </el-form-item>

         </el-tab-pane>
         <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
               <!-- 复选框组 -->
               <el-checkbox-group v-model="item.attr_vals">
                   <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                  </el-checkbox-group>
            </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品属性" name="2">
             <!-- 渲染表单item项 -->
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
               <!-- 输入框 -->
               <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
         </el-tab-pane>
         <el-tab-pane label="商品图片" name="3">
             <el-upload
                :action="upLoadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
             </el-tab-pane>
         <el-tab-pane label="商品内容" name="4">
           <!-- 富文本编辑器组件 -->
           <quill-editor v-model="addForm.goods_introduce"></quill-editor>
           <!-- 添加商品按钮 -->
           <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
         </el-tab-pane>
       </el-tabs>
    </el-form>
     </el-card>

     <!-- 图片预览 -->
     <el-dialog
       title="图片预览"
       :visible.sync="previewDialogVisible"
       width="30%">
       <img :src="previewPath" alt="图片预览" class="previewImg">
     </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 进度条
      // tab栏与进度条联动 :active="acitiveIndex - 0"，此处字符串到时候-0，自动变成整型
      acitiveIndex: '0',
      // 表单数据
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品详情描述-富文本组件
        goods_introduce: '',
        // 动态参数，静态属性
        attrs: []
      },
      // 表单校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      catelist: [],
      // 级联选择器配置
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        checkStrictly: true
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的url地址
      upLoadURL: 'http://192.168.1.225:8888/api/private/v1/upload',
      // 图片上传组件的header请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片路径
      previewPath: '',
      // 图片预览对话框显示隐藏
      previewDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品列表，用于选择分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败')
      } else {
        this.catelist = res.data
      }
    },
    // 级联选择器-选中项变化触发
    handleChange () {
      // console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        this.$message.error('请选择三级分类')
      }
    },
    // tab栏切换拦截，类似路由导航守卫
    beforeTabLeave (activeName, oldActiveName) {
      // oldActiveName-即将离开的标签页名字
      // activeName-即将进入的标签页名字
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        // 禁止切换标签页
        return false
      }
    },
    // tab栏点击事件
    async tabClick () {
      // 点击第二项，动态参数面板
      if (this.acitiveIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        } else {
          res.data.forEach(item => {
            item.attr_vals = (item.attr_vals.length === 0 ? [] : item.attr_vals.split(' '))
          })
          // console.log(res.data)
          this.manyTableData = res.data
        }
      } else if (this.acitiveIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        } else {
          // res.data.forEach(item => {
          // item.attr_vals = (item.attr_vals.length === 0 ? [] :      item.attr_vals.split(' '))
          // })
        //   console.log(res.data)
          this.onlyTableData = res.data
        }
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      // 由于默认返回127.0.0.1是服务器的，所以需要调整
      console.log(file.response.data.url)
      const newPath = file.response.data.url.replace('127.0.0.1', '192.168.1.225')
      console.log(file.response.data.url)
      this.previewPath = newPath
      this.previewDialogVisible = true
    },
    // 处理图片叉叉
    handleRemove (file) {
      // 1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2、从pics数组中，找到这个图片的对应索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3、调用数组的splice方法，把图片信息对象，从pics数组中删除
      this.addForm.pics.splice(i, 1)
    //   console.log(this.addForm)
    },
    // 监听图片上传成功事件
    handleSuccess (response) {
      // 1、拼接得到图片信息对象
      const picsInfo = { pic: response.data.tmp_path }
      // 2、将图片信息对象，push到pics数组
      this.addForm.pics.push(picsInfo)
    //   console.log(this.addForm)
    },
    // 添加商品-深拷贝（级联和后台参数冲突）
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        } else {
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          // 赋值给最终form
          form.attrs = this.addForm.attrs
          console.log(form)
          // 发起请求-添加商品
          // 商品名称必须是唯一的
          const { data: res } = await this.$http.post('goods', form)
          if (res.meta.status !== 201) {
            return this.$message.error(`添加商品失败-${res.meta.msg}`)
          } else {
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
          }
        }
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
